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ReactBeginner#fundamentals
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React Interview Questions
44 questions · Hooks, components, performance, SSR and modern React interview questions.
44 results
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ReactBeginner#jsx
What is JSX?
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ReactBeginner#props#state
Difference between props and state?
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ReactIntermediate#forms
What are controlled and uncontrolled components?
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ReactIntermediate#fundamentals#performance
What is the virtual DOM and reconciliation?
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ReactBeginner#lists
Why do lists need keys?
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ReactBeginner#hooks#state
What is useState and how do you update state correctly?
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ReactIntermediate#hooks#effects
Explain useEffect and its dependency array.
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ReactIntermediate#hooks
What are the rules of hooks?
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ReactIntermediate#hooks#refs
What is useRef used for?
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ReactAdvanced#hooks#performance
Difference between useMemo and useCallback?
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ReactAdvanced#performance
What is React.memo?
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ReactIntermediate#hooks#context
What is useContext and when do you use it?
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ReactAdvanced#hooks#state
When should you use useReducer instead of useState?
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ReactIntermediate#hooks
How do you create a custom hook?
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ReactIntermediate#effects#data
How do you fetch data in a React component?
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ReactAdvanced#effects#debugging
What causes an infinite re-render loop?
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ReactIntermediate#state#patterns
What is lifting state up?
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ReactIntermediate#patterns#context
What is prop drilling and how do you avoid it?
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ReactBeginner#patterns
What is the children prop and composition?
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ReactBeginner#jsx
What are fragments and why use them?
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ReactBeginner#jsx
What is conditional rendering in React?
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ReactAdvanced#errors
What is an error boundary?
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ReactIntermediate#lifecycle#hooks
How does the component lifecycle map to hooks?
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ReactAdvanced#performance
What is lazy loading and code splitting in React?
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ReactAdvanced#performance#data
What is Suspense?
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ReactAdvanced#patterns
What are higher-order components (HOCs)?
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ReactAdvanced#patterns#dom
What are React portals?
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ReactAdvanced#performance
How do you optimise performance in a React app?
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ReactAdvanced#ssr#seo
What is the difference between client-side and server-side rendering?
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ReactAdvanced#ssr
What is hydration?
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ReactIntermediate#forms
How do you handle forms and validation in React?
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ReactAdvanced#hooks#effects
What is the difference between useEffect and useLayoutEffect?
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ReactIntermediate#effects#debugging
What is StrictMode and why does my effect run twice?
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ReactAdvanced#state#patterns
How do you share state between distant components?
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ReactAdvanced#state#data
What is the difference between server state and client state?
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ReactIntermediate#state
Why should you not mutate state directly?
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ReactIntermediate#routing
How do you handle routing in React?
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ReactBeginner#props
What are default props and prop validation today?
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ReactBeginner#fundamentals
What is the key difference between class and function components?
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ReactIntermediate#debugging
How do you debug a React app?
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ReactAdvanced#testing
How do you test React components?
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ReactIntermediate#accessibility
What accessibility basics should a React component follow?
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ReactAdvanced#context#performance